Radial and axial distribution of tracks on the LR-115 detector inside a radon diffusion chamber

This study examined the spatial distribution of alpha particle tracks on the LR-115 Solid-state Nuclear Track Detector created by the alpha particles from the decay of radon and its progeny, by means of experimental approach and theoretical modeling. The experiment involved radon source and a cylindrical diffusion chamber with detectors at the bottom and on the wall of the chamber. Theoretical modeling comprises of analytical model of diffusion chamber, which include diffusion deposition and decay of radon and its progeny. Track density distribution greatly depends on chamber size, particle detection angle, and the energy window at which the particle is detectable by the LR-115 detector. Both experimental and theoretical research shows nonuniformity of the track density. In addition, track density distribution was explored by examining partial contributions from volumetric and deposited radon and its progeny tracks. As the radial distance from the detector center grows, side-wall contributions increase, and volumetric contributions decrease. Changing chamber dimensions alters the distribution of visible tracks on the detector surface.